High Temperature and Pressure Pure-Silica Zeolite Ammonia Adsorbents and Their Use in Pressure Swing Adsorption Separations

High Temperature and Pressure Pure-Silica Zeolite Ammonia Adsorbents and Their Use in Pressure Swing Adsorption Separations | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Research Article High Temperature and Pressure Pure-Silica Zeolite Ammonia Adsorbents and Their Use in Pressure Swing Adsorption Separations Michael Tsapatsis, Nayeon Kang, Juan C. Muñoz-Senmache, Prerna Prerna, and 11 more This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5419274/v2 This work is licensed under a CC BY 4.0 License Status: Posted Version 2 posted You are reading this latest preprint version Show more versions Abstract Separating ammonia from the reactor effluent remains a major energy bottleneck in industrial synthesis processes, where cryogenic condensation is typically employed. This method is energy-intensive, and alternative approaches such as pressure swing adsorption have not been widely adopted due to challenges associated with ammonia’s high affinity for adsorbents and the difficulty of complete regeneration under practical conditions. Here, we introduce pure- silica zeolites for this application. We determine first the high-pressure high-temperature adsorption data using a specially designed adsorption equipment. Our findings indicate that pure-silica zeolites exhibit high ammonia working adsorption capacity compared to previously reported commercial adsorbents. Molecular simulations provide information on adsorbate distribution and explain observed trends in adsorbed amounts and enthalpies. A 4-column 4- step pressure and temperature swing adsorption is designed and modeled at process relevant conditions, achieving ammonia purity above 99 % and recovery over 98 %, demonstrating the potential of replacing the energy intensive cryogenic separation. Physical sciences/Engineering/Chemical engineering Physical sciences/Chemistry/Chemical engineering Full Text Additional Declarations There is NO Competing Interest. Supplementary Files AmmoniaZeosilAdsorptionNatChemEngSI20251130final.pdf Supporting Information Cite Share Download PDF Status: Posted Version 2 posted You are reading this latest preprint version Show more versions Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-5419274","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":557349055,"identity":"2ed06622-d6f2-4aa8-b72a-027dd3f9ba77","order_by":0,"name":"Michael Tsapatsis","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAAzUlEQVRIiWNgGAWjYBADHgb2hjQQg7GBsFIQSADSPAdI1MLAIJHARpwWe/7Dzx78/FEnIz/zwbPHPAw2shsOELJFIs3csCfhMI/B7YR0Yx6GNGMitDCYSfAkHOAxkE5Ik+ZhOJxIWAv/8W+SfxLqeORnHgBp+U+EFoYcM2meBGYehhsMIC0HiNByI6fcWCYN6JczCWmScwySjWcS0sLef3zbwzc2dfby7WfSJN5U2Mn2EdICBGwwCxMYGAwIK0fWwk6E8aNgFIyCUTAiAQBYKTzyzIPATAAAAABJRU5ErkJggg==","orcid":"","institution":"Johns Hopkins University","correspondingAuthor":true,"prefix":"","firstName":"Michael","middleName":"","lastName":"Tsapatsis","suffix":""},{"id":557349056,"identity":"18b22cff-3115-4a7c-848f-a3e909fc8bfa","order_by":1,"name":"Nayeon Kang","email":"","orcid":"","institution":"Institute for NanoBioTechnology \u0026 Department of Chemical and Biomolecular Engineering, Johns Hopkins University","correspondingAuthor":false,"prefix":"","firstName":"Nayeon","middleName":"","lastName":"Kang","suffix":""},{"id":557349057,"identity":"49c57206-c1e7-4989-bc29-903737644c1c","order_by":2,"name":"Juan C. 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Separations\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research 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This method is energy-intensive, and alternative approaches such as pressure swing adsorption have not been widely adopted due to challenges associated with ammonia’s high affinity for adsorbents and the difficulty of complete regeneration under practical conditions. Here, we introduce pure- silica zeolites for this application. We determine first the high-pressure high-temperature adsorption data using a specially designed adsorption equipment. Our findings indicate that pure-silica zeolites exhibit high ammonia working adsorption capacity compared to previously reported commercial adsorbents. Molecular simulations provide information on adsorbate distribution and explain observed trends in adsorbed amounts and enthalpies. A 4-column 4- step pressure and temperature swing adsorption is designed and modeled at process relevant conditions, achieving ammonia purity above 99 % and recovery over 98 %, demonstrating the potential of replacing the energy intensive cryogenic separation.\u003c/p\u003e","manuscriptTitle":"High Temperature and Pressure Pure-Silica Zeolite Ammonia Adsorbents and Their Use in Pressure Swing Adsorption Separations","msid":"","msnumber":"","nonDraftVersions":[{"code":2,"date":"2026-01-05 22:25:45","doi":"10.21203/rs.3.rs-5419274/v2","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}},{"code":1,"date":"2025-12-09 04:26:23","doi":"10.21203/rs.3.rs-5419274/v1","editorialEvents":[{"type":"communityComments","content":0}],"status":"published","journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true}}],"origin":"","ownerIdentity":"976c941e-e1e0-445d-b9ad-4485f48d49e8","owner":[],"postedDate":"January 5th, 2026","published":true,"recentEditorialEvents":[],"rejectedJournal":[],"revision":"","amendment":"","status":"posted","subjectAreas":[{"id":59683503,"name":"Physical sciences/Engineering/Chemical engineering"},{"id":59683504,"name":"Physical sciences/Chemistry/Chemical engineering"}],"tags":[],"updatedAt":"2025-12-09T04:26:23+00:00","versionOfRecord":[],"versionCreatedAt":"2026-01-05 22:25:45","video":"","vorDoi":"","vorDoiUrl":"","workflowStages":[]},"version":"v2","identity":"rs-5419274","journalConfig":"researchsquare"},"__N_SSP":true},"page":"/article/[identity]/[[...version]]","query":{"redirect":"/article/rs-5419274","identity":"rs-5419274","version":["v2"]},"buildId":"XKTyCvWXoU3ODBz1xrDgd","isFallback":false,"isExperimentalCompile":false,"dynamicIds":[84888],"gssp":true,"scriptLoader":[]}